%0 Journal Article %A Katica %A Stevanović %A Hedrih %A Predrag Kozić %A Ratko Pavlovi %T A stationary and nonstationary $R$-frequency analysis of vibrations of the systems with a finite number of degrees of freedom of vibrations and mutual influences of the harmonics %J Theoretical and applied mechanics %D 1985 %P 73 %V 11 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TAM_1985_11_1_a6/ %G en %F TAM_1985_11_1_a6